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Newton's first law: the law of inertia.

Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Answer: the law of inertia .

Explanation: the law of inertia is the first law of motion . Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. HOPE IT HELPS YOU .THANKS .